TBH I did smile like this the other day (and realised I was doing it). I got stopped by the cops at a random breath testing station. I hadn't done anything wrong, but for some reason I feel like I have every time I encounter the police. I pulled up, wound down the window and smiled in an attempt to be pleasant and appreciative of the police. Instead I just sat there, grinning like an idiot at the cop, who stared back at me, humourlessly. At the time I thought, "what the hell am I doing! Stop smiling like that, she'll think you've done something wrong", but I couldn't stop myself. Obviously she did suspect something, because she really examined me carefully, and after breath testing me (and passing) she also checked my warrant of fitness and registration (which were fine, fortunately). She then took one last suspicious look at me (because I was still smiling), and then let me go. I drove off wondering what the hell is wrong with me.